fastlane: pilot crashes with: submit_testflight_build_for_review!': [!] undefined method....

Issue Description

This issue happens when running my beta lane: fastlane beta

Everything runs soothly, until it tries to submit the app for review after the processing finishes with iTunes.

Pilot crashes the process with : submit_testflight_build_for_review!':[!] undefined method…

This happens in the pilot step in my fastfile to distribute to external:

pilot(distribute_external: true, "Some text here")

Complete output when running fastlane, including the stack trace and command used

/Library/Ruby/Gems/2.0.0/gems/spaceship-0.27.2/lib/spaceship/tunes/tunes_client.rb:618:in `submit_testflight_build_for_review!': [!] undefined method `[]' for nil:NilClass (NoMethodError)
    from /Library/Ruby/Gems/2.0.0/gems/pilot-1.9.2/lib/pilot/build_manager.rb:127:in `distribute_build'
    from /Library/Ruby/Gems/2.0.0/gems/pilot-1.9.2/lib/pilot/build_manager.rb:43:in `upload'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/actions/pilot.rb:18:in `run'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:197:in `block (2 levels) in execute_action'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/actions/actions_helper.rb:35:in `execute_action'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:182:in `block in execute_action'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:181:in `chdir'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:181:in `execute_action'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:107:in `trigger_action_by_name'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/fast_file.rb:140:in `method_missing'
    from Fastfile:87:in `block (2 levels) in parsing_binding'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/lane.rb:33:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/lane.rb:33:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:50:in `block in execute'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:46:in `chdir'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/runner.rb:46:in `execute'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/lane_manager.rb:46:in `cruise_lane'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/command_line_handler.rb:30:in `handle'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/commands_generator.rb:51:in `block (2 levels) in run'
    from /Library/Ruby/Gems/2.0.0/gems/commander-4.3.5/lib/commander/command.rb:178:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/commander-4.3.5/lib/commander/command.rb:178:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/commander-4.3.5/lib/commander/command.rb:153:in `run'
    from /Library/Ruby/Gems/2.0.0/gems/commander-4.3.5/lib/commander/runner.rb:428:in `run_active_command'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane_core-0.48.1/lib/fastlane_core/ui/fastlane_runner.rb:26:in `run!'
    from /Library/Ruby/Gems/2.0.0/gems/commander-4.3.5/lib/commander/delegates.rb:15:in `run!'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/commands_generator.rb:244:in `run'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/commands_generator.rb:20:in `start'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/lib/fastlane/cli_tools_distributor.rb:47:in `take_off'
    from /Library/Ruby/Gems/2.0.0/gems/fastlane-1.97.0/bin/fastlane:5:in `<top (required)>'
    from /usr/local/bin/fastlane:23:in `load'
    from /usr/local/bin/fastlane:23:in `<main>'

Fastfile

Fastfile:

desc "Submit a new Beta Build to Apple TestFlight"  
lane :beta do

    #default_payloads: [:test_result, :git_branch]
    #PULL GIT WITH LATEST CHANGES
    slack(
      message: "[FastLane] Starting BETA Integration.",
      success: true,        # optional, defaults to true   
      default_payloads: []
    )   

    ensure_git_branch(
      branch: 'develop'
      )

    git_pull                


  #SIGN PROVISIONING PROFILES      
  slack(
    message: "[FastLane] Signing Provisioning Profiles.",
    success: true,        # optional, defaults to true   
    default_payloads: []
  )   

  sigh

    #INCREMENT BULD NUMBER
    increment_build_number    
    build_number = Actions.lane_context[Actions::SharedValues::BUILD_NUMBER]
    # add_git_tag(tag: "testflight-#{build_number}")      

    #BUILD APP
    slack(
      message: "[FastLane] Compiling Build: #{build_number}",
      success: true,        # optional, defaults to true   
      default_payloads: []
    )   


    gym(scheme: "MyApp",
         clean: true        
      )       

    #COMMIT VERSION
    commit_version_bump(
      message: 'minor [CI] Build Bump'
      )    

      #PUSH GIT
      push_to_git_remote


    slack(
      message: "[FastLane] Build #{build_number} Now Commited. \n Delivering App. ",
      success: true,        # optional, defaults to true   
      default_payloads: []
    )   

    pilot(distribute_external: true, 
        changelog: "We constantly improve our app and deliver upgrades. This release includes bug fixes and performance enhancements."
    ) # Also Distribute to external testers

    end

Environment

fastlane version (run fastlane -v): fastlane 1.97.2